Identify the INCORRECT statement about the human skeleton: MCQ with Answer and Explanation

Explanation:
Abscisic acid (ABA) is known as the stress hormone because it plays a crucial role in plant responses to environmental stresses, particularly drought. It induces the closure of stomata to reduce water loss (transpiration) and also inhibits seed germination and growth, helping the plant survive adverse conditions.

Explanation:
Lymphatic vessels collect interstitial fluid (lymph) and return it to the venous circulation (subclavian veins). This maintains fluid balance. Along the way, lymph nodes filter pathogens. The heart pumps blood, kidneys filter blood, lungs exchange gases. The lymphatic system is unidirectional.

Explanation:
Mammalia is the only class of animals that possess mammary glands, which produce milk to nourish their young ones. Other defining features of mammals include the presence of hair on the skin, external pinnae (ear flaps), a four-chambered heart, and being warm-blooded (homeothermic). Examples include humans, whales, and bats.